36

This sounds like undesirable behaviour to me. Here are the main problems in my mind: The cat could fall into the tank, damage the terrapin or tank, splash water on an electrical appliance, etc. Terrapins are known for being nippy. If it nips your cat you could open yourself up to any number of issues for both parties. The water in your fish tank may not be ...


22

It is actually not uncommon for fish to disappear, seemingly without a trace. It has happened to me a few times. Sometimes you eventually find out what happened, sometimes you don't. There are several things that could have happened to it. Each of these things has happened to my fish at some point in the past. It might be hiding. Some fish are really ...


18

Amano shrimp are good tank mates for community fish. They'll ignore your fish altogether. And they eat algae 24x7, which never hurts. Amano shrimp require brackish water for breeding, so won't breed in most tanks. This also makes them difficult to find. Cherry shrimp (and their color varieties) will also be no threat to your fish. But, they are very ...


17

Ich Ichthyophthirius multifiliis (Source: aquariacentral.com) Ich is an tiny ectoparasite that can harm fish if they succumb to it. If not cared for properly, it can kill fish. It's important to note that ich is always present, and there is nothing you can do to get rid of it. Fish are naturally immune to ich, and only succumb to it when their immune ...


17

The cat might also like the taste of the water. Some animals are quite the connoisseurs. My dog prefers to drink "old" water from a big basin standing outside, one cat enjoys licking up the water puddles beneath my flower pots and the other cat prefers fresh tap water. The chemistry of tap water differs so much from aquarium water that even you ...


15

Well, you didn't say so, but I assume you have a thermometer inside your tank, don't you? Or did you measure the temperature using a portable, temporary one? Since your tank is inside your house, it's not directly at sunlight, perhaps some breeze was on it, etc. For the solutions, since it only happens few times a year, I'd go with ice cubes of pre-treated ...


15

This is a good example of overstocking a fish tank. Don't feel too bad about it, I don't know anyone who didn't overstock their tank the first time. It's just too tempting. Here's the problem though... Fish waste contains ammonia, which is toxic to fish. Which wouldn't be a problem for them in a lake or river, but we keep them in a glass box. Meaning, ...


15

They sell fountains for cats. Basically, it's a water bowl (or basin) for the cat to drink from. The bowl is hooked up to a circulating system that keeps the water flowing. This is why your cat is attracted to the aquarium. Though many cats will drink still water, it's not uncommon for individual cats to be turned off by the idea. In the wild, still water ...


14

Neons and black skirt tetras* are both easy-going fish, so you won't have much problem with them being aggressive to newcomers. As long as anything you add isn't highly predatory/aggressive and isn't too huge, they'll probably play nice. (Bear in mind that if one fish can fit another into its mouth, it probably will at some point.) One thing that I'm not ...


13

You're changing an awful lot of variables all at once, so your readings (and your nitrogen cycle) are likely way off. Slow down a bit, and let's look at the possibilities one at a time. First, most water treatments that neutralize ammonia work by converting the ammonia (NH3) into harmless ammonium (NH4+), which will by removed by your bio filters. The test ...


12

I have kept all kinds of tetras: cardinal tetras; rummy-nose tetras; balloon red eye tetras; penguin tetras with neons; black neons without any problem. Apart from the tetra species, you can keep harlequin rasboras, nerite snails and Amano shrimps as well.


12

Tiger barb prefer a well-planted aquarium, that would imitate their original environment. Tetras, in general, also like some plants to hide them from the light. Since there are so many specimens of plants, with so many shapes, sizes, densities... I think the best way to "measure" how much plants you could have would have to take into account all ...


12

So... What I would consider/do is: Tank capacity according to the fish you already have and the size of your current tank. Bear in mind that these are rules of thumb. The species you have and the species you intend to add. I don't know what you have and what you'd like to get, but before doing so, do check. Feed the fish in your current tank before adding ...


12

These actually sound like snail eggs to me. Your tetras are egg scatterers, and lay tiny eggs hidden in rocks or thick plants growth. You can see what their eggs look like in this video -- very tiny, and not protected in a gelatinous mass like the ones you've found. (Note that your tetras are an albino or leucistic strain of the ones in the video, but the ...


12

John Cavan's advice is good. Some additional advice that I learned the hard way after many years of owning 80 and 300 litre freshwater tanks: If you don't have a working understanding of pH, it is helpful to read up on it. A precise definition of pH is unnecessary; a good way to think of it is that pH measures the amount of free hydrogen atoms in the water. ...


11

When determining the capacity of an aquarium, it is common to look at total fish length rather than number of fish. The idea is that bigger fish need more room. The rule-of-thumb I've always used for freshwater tropical fish is 1 inch of fish length per gallon of water (or about 25 mm of fish length per 4 liters). However, this can vary greatly based on ...


11

To tell which are the girls, which are the boys: Juvenile convict cichlids are monomorphic until they reach sexual maturity. The male is mostly gray with light black stripes along the body. Males are larger than females, and they have more pointed ventral, dorsal and anal fins which often extend into filaments. In addition, older males frequently develop ...


11

One piece of advice I've seen is to use bait to lure the snails out, and then physically remove them. This may help you keep up with them. Methods of baiting range from simple (put a large piece of lettuce in your tank, turn down the lights, and wait a few hours) to more involved (build a small "trap" by placing food the snails will find attractive in a ...


10

You might consider adding a few Assassin Snails to the tank. I had a rapidly growing population of pond and ramshorn snails after I had introduced some plants into my tank, and was looking for a solution. I saw them at the local pet place when I was out looking for loaches, and after a bit of research decided to give them a try. Assassin snails are ...


10

Unfortunately I'd say no, not if you still have that much ammonia showing up. The rule of thumb I've seen is you should be able to add 2ppm ammonia and have it completely converted to nitrates within 24 hours. It's odd that you're seeing ammonia and nitrates at this stage: you tend to see the ammonia-consuming bacteria show up very quickly (see the graph ...


10

Assuming you have an appropriate filter setup and do regular water changes, this is probably fine. My caveat is that AqAdvisor treats the loaches as potentially reaching 10" (25 cm), which would be a bit large. Fishbase says the largest on record was about 6" (15 cm) though; I'm not sure which site has the better handle on that species. (Note that I picked a ...


9

Well, "in balance" could mean a lot of things, but I'm guessing you mean you want to add plants to keep your water quality in check. If that's the case, the better solution might be to look for improvements in your filtration and maintenance routine first: 30 or 40 fish is a pretty full load for a ~120L/30gal tank, so there might be more effective, or even ...


9

There are a few ways to reduce the frequency of water changes for your turtle. Just keep in mind there is no running away from water changes. Have an efficient biological filter: This very obvious way is probably the most important. I'm not particularly sure about the filter you have, but essentially in turtle tanks you want to cycle the water at least ...


8

According to thinkfish.co.uk, snails are a potential disease vector. However, this is usually only an issue if the snails come from the wild, or from a tank that already has a disease infecting the residents. So long as you are reasonably certain of the provenance of your snails, you should be safe. Keep in mind, though, that snail eggs can be easy to ...


8

At this stage, I would look to add fish and stop artificially adding ammonia to the system. Ideally, you want to start small, with a few hardy fish added to the tank, much less than your tank is expected to handle, and then begin adding more fish over the next few weeks as you system equalizes from the prior additions. Basically, you now want to slowly ...


8

There are some rules of thumb and even stocking calculators out there that you can use to get a rough sense of what works, but every new tank setup could use a bit of research. There's a lot of complexity, but there's also a lot of experience out there, and it's always a good idea to get feedback on your stocking and setup plans. You have to consider, ...


8

Check your water parameters, it should have 0 ammonia, 0 nitrite. Some nitrate presence is not lethal as long as it's within the limit. Match the pH and temperature depending on the species you plan to put it. Water should not be cloudy. There should not be any bio-film forming on top of the aquarium. In case it forms, increase surface agitation. Make sure ...


8

The first, and possibly most important, thing to look at is your tank size. In my opinion, .5 gallons is way too small of a living space for 4 fish. If you have room for a larger tank, I recommend it. A bigger tank means more surface area, which means more contact with the air. The most basic way to introduce oxygen to a still body of water (such as your ...


8

Fish have cells called chromatophores that produce the pigments that give coloration or reflect light. The colour of a fish is determined in part by which pigments are in the cells (there are several colours), how many pigment molecules there are, and whether the pigment is clustered inside the cell or is distributed throughout the cytoplasm. Another thing ...


8

Looks like a damselfly larvae to me, which isn't actually a parasite. It is, however, carnivorous... If your fish were larger, this larvae could have turned into food for them, but not in this case as you have small fish. So, as it is they can be dangerous to your fish and shrimp, so best to make sure you get them out of the tanks as soon you find them. ...


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